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#! /usr/bin/perl -w
use strict;
use POSIX qw(tmpnam);
my $pkgfile = $ARGV[0];
die unless defined $pkgfile;
my $tmpdir;
do { $tmpdir = tmpnam(); }
until mkdir $tmpdir, 0777;
# !!! remove tmpdir on exit
print "Unpacking $pkgfile in $tmpdir...\n";
system "bunzip2 < $pkgfile | (cd $tmpdir && tar xf -)";
die if $?;
print "This package contains the following derivations:\n";
system "nix-env -qasf $tmpdir/default.nix";
die if $?;
print "Do you wish to install these (Y/N)? ";
my $reply = <STDIN>;
chomp $reply;
exit if (!($reply eq "y"));
print "Pulling caches...\n";
system "nix-pull `cat $tmpdir/caches`";
die if $?;
print "Installing package...\n";
system "nix-env -if $tmpdir/default.nix '*'";
die if $?;
print "Installation succeeded! Press Enter to continue.\n";
<STDIN>;
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